ip routing after changing mac address to a virtual one

ip routing after changing mac address to a virtual one

[first last]

Hi all.

 I have a SuSE Linux box with two network interfaces.
An ethernet which I use to connect to the ISP, and a
wireless interface to share Internet with my room
mate. The problem is when I change the MAC address of
my ethernet card (eth1) in order to get a different IP
address from ISP, iptables no longer does the
masquerading, thus my friend can't access to the
Internet anymore. I try to restart iptables but
nothing happens. Our guess is that iptables uses real
mac addresses of network interfaces to forward and NAT
ip packets, so it doesn't work with virtual MAC
address.

can anyone please suggest a solution to this issue?

Thank you very much


 
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Re: ip routing after changing mac address to a virtual one

[Mike]

trying to understand your question better -- does eth1 use dhcp to get
a connection from the ISP?

On 11/25/06, first last <doctor_konkord@yahoo.com> wrote:
> Hi all.
>
>  I have a SuSE Linux box with two network interfaces.
> An ethernet which I use to connect to the ISP, and a
> wireless interface to share Internet with my room
> mate. The problem is when I change the MAC address of
> my ethernet card (eth1) in order to get a different IP
> address from ISP, iptables no longer does the
> masquerading, thus my friend can't access to the
> Internet anymore. I try to restart iptables but
> nothing happens. Our guess is that iptables uses real
> mac addresses of network interfaces to forward and NAT
> ip packets, so it doesn't work with virtual MAC
> address.
>
> can anyone please suggest a solution to this issue?
>
> Thank you very much
>
>
>
> ____________________________________________________________________________________
> Do you Yahoo!?
> Everyone is raving about the all-new Yahoo! Mail beta.
> http://new.mail.yahoo.com
>
>

Re: Re: ip routing after changing mac address to a virtual one

[first last]

Hi Mike,

Yes, eth1 gets its IP address from DHCP server. DHCP
server always gives me the same IP address because it
knows my MAC address. So I only can get a different IP
address by changing my MAC address.

B.R

Sina

>
>
>trying to understand your question better -- does
eth1 use dhcp to get
>a connection from the ISP?
>
>On 11/25/06, first last  wrote:
>> Hi all.
>>
>>  I have a SuSE Linux box with two network
interfaces.
>> An ethernet which I use to connect to the ISP, and
a
>> wireless interface to share Internet with my room
>> mate. The problem is when I change the MAC address
of
>> my ethernet card (eth1) in order to get a different
IP
>> address from ISP, iptables no longer does the
>> masquerading, thus my friend can't access to the
>> Internet anymore. I try to restart iptables but
>> nothing happens. Our guess is that iptables uses
real
>> mac addresses of network interfaces to forward and
NAT
>> ip packets, so it doesn't work with virtual MAC
>> address.
>>
>> can anyone please suggest a solution to this issue?
>>
>> Thank you very much



 
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Everyone is raving about the all-new Yahoo! Mail beta.
http://new.mail.yahoo.com

Re: ip routing after changing mac address to a virtual one

[Martijn Lievaart]

first last wrote:

>Hi Mike,
>
>Yes, eth1 gets its IP address from DHCP server. DHCP
>server always gives me the same IP address because it
>knows my MAC address. So I only can get a different IP
>address by changing my MAC address.
>  
>

[ Please don't toppost ]

Try to shutdown the interface, change the MAC, then bring the interface 
back up. Masquerading is a bit strange and I'm not completely sure what 
will work when. However, this way, it should definately work.

HTH,
M4